 |
| Titel |
MAX-DOAS observations at Penlee Point Atmospheric Observatory, South England |
| VerfasserIn |
Johannes Lampel, Mingxi Yang, Nicolai Poggenhans, Joelle Buxmann, Denis Pöhler, Stefan Schmitt, Johannes Zielcke, Udo Frieß, Thomas Wagner, Ulrich Platt |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250151205
|
| Publikation (Nr.) |
 EGU/EGU2017-15766.pdf |
|
|
|
|
|
| Zusammenfassung |
| For almost one year MAX-DOAS observations were performed at the Penlee Point
Atmospheric Observatory close to Plymouth, South England, in order to quantify abundances
of reactive halogen species (RHS) and their potential impact on diurnal ozone observations.
The observatory is located directly at the coast at the entrance of the Plymouth sound. Thus,
the measurements mostly probed air masses from the open ocean, which are potentially
influenced by coastal emissions. Depending on the wind direction, the observations are also
influenced by urban pollution from the city of Plymouth and by shipping emissions from
the sound and the English Channel. NO2 and HCHO were clearly detected. No
significant absorptions above the instrumental detection limit (DL) of 1 ppt (BrO) and
0.6 ppt (IO) were observed. Also Glyoxal could not be detected above the DL of
20 ppt. SO2, HONO and OClO were also not observed above the respective DL.
The data set is suitable also to show a series of general properties for the spectral
retrieval of MAX-DOAS data. We show estimates for the O4 absorption bands at
cross-section around 328nm and 419nm, which were usually not considered in the past and
can in turn improve the spectral retrieval in the wavelength range used for BrO
and HCHO significantly. Thus, reduction of BrO and HCHO DL of typically 35%
could be achieved. The long term measurements also show that the used recently
available commercial MAX-DOAS allow high quality measurements like expensive
custom-made instruments. The performance of the instrument will be presented. |
|
|
|
|
|
|